Tubular column pressure control device for oil and gas well perforation operation

Abstract

The utility model relates to the field of oil exploitation, in particular to a tubular column pressure control device for oil and gas well perforation operation. Comprising an upper joint, a lower joint, a sliding sleeve and a shearing sleeve, the upper connector and the lower connector are connected to the two ends of the sliding sleeve respectively, the sliding sleeve is arranged in the upper connector through a shearing sleeve, a communicating hole used for well fluid to flow in is formed in the surface of the upper connector, and the communicating hole can be opened or closed through the sliding sleeve. According to the utility model, through the matching of the sliding sleeve and the shearing sleeve, the communicating hole of the device is in an open state in the use process, and when the device is mounted on a perforation tubular column to enter a well and the tubular column is lowered into the well, well control fluid can be circulated midway, so that the well control risk is effectively reduced, and the safety and the stability of operation are ensured; when the pipe column is tripped into the well bottom, if hydraulic pumping tool operation needs to be carried out, the operation requirement can also be met in the mode of positive circulation of well killing fluid, and high flexibility and adaptability are achieved.

Description

Technical Field

[0001] The utility model relates to the field of petroleum exploitation, in particular to a pipe string pressure control device for oil and gas well perforation operation. Background Art

[0002] After the drilling of an oil and gas well is completed, casing needs to be installed in the wellbore to complete the well completion operation. After completion, when the oil and gas well enters the production stage, in order to establish a channel for the fluid to flow from the formation to the wellhead, perforation operations are usually required or the production string is lowered into the well. During this process, ensure that the oil pipe and the installed casing remain connected. Once the production string is successfully lowered to the predetermined well depth, according to specific engineering requirements and production strategies, this flow channel needs to be closed in time, such as using devices such as packers and plugs to control the fluid channel between the oil pipe and the casing.

[0003] The Chinese patent publication number is CN111608614B, and the invention patent named "Switch sleeve device, oil and gas production tool and switch method for oil and gas production" discloses a switch sleeve device, which uses a front and rear two-stage trigger body to trigger the sleeve to operate, open the wall through hole and close the wall through hole; the specific structure discloses an outer cylinder, a switch sleeve mechanism and a trigger body, when the trigger body is put into the outer cylinder and punches to trigger the switch sleeve mechanism, the switch sleeve mechanism can switch from the state of opening the wall through hole to the state of closing the wall through hole until it is triggered by the trigger body or another trigger body again, and then switches from the state of closing the wall through hole to the state of opening the wall through hole. The switch method of the wall through hole of the oil and gas production tool includes: putting the trigger body into the outer cylinder to open the wall through hole, and putting the trigger body into the outer cylinder again to close the wall through hole.

[0004] The problem with the above structure is that the wall through hole of the device is in a closed state when it is initially lowered into the well. During the process of lowering the tubing string into the well, the annulus formed by the oil pipe and the casing is not connected. During the process of lowering the tubing string, the liquid in the well cannot be circulated to realize the circulating well pressure fluid, which increases the well control risk and cannot realize hydraulic pumping tools in the tubing string. At the same time, in a horizontal well, the trigger body cannot reach the position of the oil and gas well production tool in the horizontal well section by its own weight. Utility Model Content

[0005] The purpose of the utility model is to propose a tubing pressure control device for oil and gas well perforation operations, so as to solve the defects in the background technology that the well cannot be entered when the wall through hole (the connecting hole between the tubing and the casing) is open, and the trigger body cannot be placed in the horizontal well section to complete the project implementation. The device can be entered into the well when the connecting hole is open. The tubing entering the oil and gas well and the casing are connected through the connecting hole. After the tubing is lowered into the wellbore, pressure is applied to the liquid in the wellbore at the wellhead to close the connecting hole of the utility model, thereby isolating the tubing from the casing.

[0006] To achieve the above object, the utility model adopts the following technical solutions:

[0007] A pipe string pressure control device for perforation operation of oil and gas wells of the utility model is characterized in that it includes an upper joint, a lower joint, a sliding sleeve and a shear sleeve; the upper joint and the lower joint are respectively connected to both ends of the sliding sleeve, the sliding sleeve is arranged inside the upper joint through the shear sleeve, a communication hole for well fluid to pass through is opened on the surface of the upper joint, and the sliding sleeve can open or close the communication hole.

[0008] As a further improvement, the shear sleeve is sleeved on the surface of the sliding sleeve, and small holes for shear pins to pass through in the radial direction of the sliding sleeve are provided, and the shear sleeve is fixedly connected to the sliding sleeve through the shear pins.

[0009] As a further improvement, a circlip is provided at one end of the sliding sleeve, and at least one sealing ring is provided at the other end.

[0010] As a further improvement, a stepped protrusion is provided between the circlip and the shear sleeve, and a supporting ring is provided between the stepped protrusions.

[0011] As a further improvement, the shear pins include large shear pins and small shear pins with different specifications.

[0012] As a further improvement, the upper joint is sequentially provided with a first thread, a first cavity, a second cavity, a communication hole and a second thread along the axial direction, and a first step is provided between the first cavity and the second cavity.

[0013] As a further improvement, a second step is provided at one end of the communication hole away from the second cavity.

[0014] As a further improvement, a concave surface is provided on the outer surface of the upper joint, and the communication hole is provided on the concave surface.

[0015] As a further improvement, the lower joint is sequentially provided with a third thread and a third cavity along the axial direction, and an external thread for connecting with the upper joint is provided on the outer surface of the lower joint.

[0016] As a further improvement, a sealing ring is also provided on the outer surface of the lower joint.

[0017] The utility model has achieved the following technical effects compared with the prior art:

[0018] Through the cooperation of the sliding sleeve and the shear sleeve provided by the utility model, the communication hole in the device is in an open state during use. When installed on the perforation pipe string and lowered into the well, during the process of lowering the pipe string into the well, the kill fluid can be circulated midway, thereby effectively reducing the well control risk and ensuring the safety and stability of the operation; when the pipe string is lowered to the bottom of the well, if hydraulic pumping tool operation is required, the operation requirements can also be achieved through the way of positive circulating the kill fluid, and it has high flexibility and adaptability.

[0019] The present utility model performs a closing operation by means of pressurization, enabling the device to control the closing of the communication hole even in complex environments such as horizontal well sections, greatly expanding the scope of well types for operation, not only improving the operation efficiency, but also further ensuring the accuracy and reliability of the operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is an assembly schematic diagram of the pipe string pressure control closing device for perforation operation of oil and gas wells of the present utility model;

[0021] Figure 2 is a schematic structural diagram of the upper joint of the present utility model;

[0022] Figure 3 is a schematic structural diagram of the lower joint of the present utility model;

[0023] Figure 4 is an assembly schematic diagram of the sliding sleeve and the shear sleeve of the present utility model.

[0024] Reference numerals: 1, upper joint; 12, first step; 13, communication hole; 14, first thread; 15, second thread; 16, first cavity; 17, second cavity; 18, second step; 2, lower joint; 22, external thread; 23, third thread; 24, third cavity; 3, sliding sleeve; 31, circlip; 32, step protrusion; 33, supporting ring; 34, sealing ring; 4, shear sleeve; 5, large shear pin; 6, small shear pin. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] The embodiments of the present application will be described in detail below. The examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present application and should not be construed as limiting the present application. On the contrary, the embodiments of the present application include all changes, modifications, and equivalents that fall within the spirit and scope of the appended claims.

[0026] The embodiments of the present invention will be described in detail below with reference to the drawings.

[0027] As Figure 1 shown, the present utility model includes an upper joint 1, a lower joint 2, a sliding sleeve 3, and a shear sleeve 4; the upper joint 1 and the lower joint 2 are respectively connected to both ends of the sliding sleeve 3, the sliding sleeve 3 is arranged inside the upper joint 1 through the shear sleeve 4, a communication hole 13 for well fluid to pass through is provided on the surface of the upper joint 1, and the sliding sleeve 3 can open or close the communication hole 13. The sliding sleeve 3 adopted in the embodiment is a differential pressure type sliding sleeve 3, and the shear sleeve 4 performs pressure control operation by using shear pins of different specifications and sizes.

[0028] As Figure 4 shown, in the embodiment, the sliding sleeve 3 is a hollow tubular structure, and a stepped protrusion 32 is further provided on the outer surface of the sliding sleeve 3. When connecting, the shear sleeve 4 is sleeved on the sliding sleeve 3. Figure 4 A circle of small holes is provided along the radial direction on the surface of the sliding sleeve 3 in the [embodiment]. The small holes are multiple and each small hole is arranged at intervals. In the embodiment, the shear sleeve 4 is sleeved at the position of the small holes. During specific use, the shear pin is inserted according to the calculated working pressure value. In addition, the number of shear pins can be installed according to different working requirements.

[0029] In the embodiment, the shear pin includes a large shear pin 5 and a small shear pin 6. The diameters of the large shear pin 5 and the small shear pin 6 are different. The diameter of the large shear pin 5 is 3 mm and it can withstand a shear force of 2.2 MPa. The diameter of the small shear pin 6 is 2 mm and it can withstand a shear force of 0.98 MPa. In the embodiment, shear pins of different specifications and sizes can withstand different pressure shear values, and can achieve uniform shearing while ensuring the shearing effect, so as to ensure that the shear pin can be completely sheared off.

[0030] In the embodiment, the shear sleeve 4 is a ring structure. The shear sleeve 4 is fixedly connected to the sliding sleeve 3 by inserting the shear pin into the holes on the shear sleeve 4 and the small holes on the sliding sleeve 3, and is placed in the upper joint 1 after being connected.

[0031] In the embodiment, a snap ring 31 is provided at the left end of the sliding sleeve 3, and a sealing ring 34 is provided at the right end; a groove is provided at the left end of the sliding sleeve 3, and the snap ring 31 is sleeved on the groove. The provided snap ring 31 in this device can tightly connect the sliding sleeve 3 and the lower joint 2 together to form a stable structure, ensuring the firmness and reliability of the connection part. In addition, when the sliding sleeve 3 moves upward, the snap ring 31 will pop out after passing through the third inner cavity 24 of the lower joint 2, thereby preventing the sliding sleeve 3 from falling back to the original position again.

[0032] As Figure 4 shown, a groove is also provided at the right end of the sliding sleeve 3 in the embodiment, and the sealing ring 34 is sleeved at this groove. In this embodiment, the sealing ring 34 preferably has three O-ring seals 34, but is not limited thereto. The number of the sealing rings 34 can be increased or decreased according to different usage scenarios. Among the three sealing rings 34, two of the sealing rings 34 are arranged near the right end edge of the sliding sleeve 3, and the other sealing ring 34 is arranged near the position of the small holes; the sealing ring 34 in the embodiment is used to seal the gap of the device to prevent liquid from leaking from the inside of the device to the external environment, and uses the structure between the sealing rings 34 to seal the communication hole 13, so as to ensure the sealing effect. In addition, the sealing ring 34 also plays a pressure-bearing role, and can resist the thrust and stress generated by the liquid pressure inside the device, ensuring the integrity of the device.

[0033] In the embodiment, a supporting ring 33 is further provided on the sliding sleeve 3. In the embodiment, the supporting ring 33 is used to seal the annulus between the sliding sleeve 3 and the upper joint 1 during the cementing process to prevent liquid leakage. In the embodiment, the supporting ring 33 is arranged between the step protrusions 32, which can further improve the annulus effect.

[0034] As Figure 2 shown is the structure of the upper joint 1 in this embodiment. The upper joint 1 is a hollow tubular structure. The first thread 14 provided at the left end of the upper joint 1 is used to connect with the lower joint 2. The first cavity 16 and the second cavity 17 can be used for the sliding sleeve 3 to move inside the upper joint 1. A first step 12 is provided between the first cavity 16 and the second cavity 17. The provided first step 12 is used for the upper end face of the shear sleeve 4 to contact the first step 12, so that the sliding sleeve 3 is located in the first cavity 16 and the second cavity 17. A communication hole 13 is provided at the other end of the second cavity 17. The provided communication hole 13 is used for injecting liquid. The other end of the communication hole 13 is provided with a second step 18. The provided second step 18 is used to limit the sliding sleeve 3. A second thread 15 is provided at the right end of the upper joint 1. In the embodiment, the second thread 15 is used to connect the device to the pipe string and access it into the pipe string.

[0035] As Figure 1 shown, when the sliding sleeve 3 is installed inside the upper joint 1, at this time the shear sleeve 4 contacts the first step 12. One end of the sliding sleeve 3 provided with the sealing ring 34 is located in the second cavity 17. When the shear pin breaks, the shear sleeve 4 separates from the sliding sleeve 3, which will cause the sliding sleeve 3 to move upward along the second cavity 17. The sliding sleeve 3 stops after its end face contacts the second step 18 of the upper joint 1. At this time, the sealing ring 34 is respectively located at the upper and lower edges of the communication hole 13. The sliding sleeve 3 can be used to block the communication hole 13 to isolate the inside of the pipe string from the casing.

[0036] In the embodiment, a concave surface is provided on the outer surface of the upper joint 1, and the communication hole 13 is arranged on the concave surface. The provided concave surface can guide the liquid to flow more smoothly, reduce the liquid resistance, and improve the liquid transmission efficiency. In the embodiment, it is preferably provided with four communication holes 13 arranged radially on the concave surface.

[0037] As Figure 3 shown, in the embodiment, the lower joint 2 is a hollow structure. A third thread 23 and a third cavity 24 are provided inside the lower joint 2. The third thread 23 is used to connect the lower joint 2 to the pipe string. The third cavity 24 is used to connect with one end of the sliding sleeve 3 (the end provided with the snap ring 31). An external thread 22 is provided on the outer surface of the third cavity 24. The external thread 22 is used to connect the lower joint 2 to the upper joint 1. Similarly, the sealing ring 34 provided on the lower joint 2 can ensure the sealing effect.

[0038] After connecting the shear sleeve 4 and the sliding sleeve 3 with a shear pin, insert one end of the sliding sleeve 3 into the upper sub 1 and the other end into the lower sub 2. Connect and screw the first thread 14 of the upper sub 1 with the external thread 22 of the lower sub 2, so that the upper sub 1 and the lower sub 2 are connected together to complete the assembly.

[0039] When this device is in use, connect this device to the pipe string and insert it into the pipe string. Since the inside of the pipe string is connected to the communication hole 13 of this device, when the pipe string is lowered into the well, the pipe string and this device are always kept connected. When the pipe string is lowered to a predetermined depth at the bottom of the well and circulating kill fluid is required, liquid can be injected into the pipe string from the wellhead. When the liquid descends through the inside of the pipe string to the position of this device, it enters this device through the communication hole 13, realizing the circulation of the kill fluid; when it is necessary to isolate the pipe string from this device, inject liquid into the pipe string at the wellhead. The liquid pressure will be transmitted to the sliding sleeve 3 through the communication hole 13. Since the bottom of the sliding sleeve 3 and the lower sub 2 are connected by a circlip 31, a gap will be generated. The liquid pressure will cause the liquid to move upward along this gap and reach the supporting ring 33 of the sliding sleeve 3, thereby pushing the sliding sleeve 3 upward; when the pressure difference reaches the strength limit of the shear pin, the shear pin is cut off, and the sliding sleeve 3 will move upward until the end face of the sliding sleeve 3 contacts the second step 18 inside the upper sub 1 and stops, so that the sliding sleeve 3 blocks the communication hole 13, thus realizing that the inside of the pipe string is no longer connected to this device and closing the annulus between the pipe string and the casing.

[0040] It should be noted that in the description of this application, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, in the description of this application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0041] Any process or method description shown in the flowchart or described in other ways herein can be understood as representing a module, segment, or part of the code including one or more executable instructions for implementing a specific logical function or process. The scope of the preferred embodiments of this application includes additional implementations, where the functions can be executed in a manner that is not shown or discussed, including in a substantially simultaneous manner or in the reverse order according to the functions involved, which should be understood by those skilled in the technical field to which the embodiments of this application belong.

[0042] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of this application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples.

[0043] Although the embodiments of this application have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limitations to this application. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of this application.

[0044] The embodiments of this application will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are only used to explain this application and should not be construed as limitations to this application. On the contrary, the embodiments of this application include all changes, modifications, and equivalents that fall within the spirit and scope of the appended claims.

[0045] The examples of this application will be described in detail below. Examples of the examples are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements with the same or similar functions throughout. The examples described below by referring to the accompanying drawings are exemplary and are intended to be used to explain this application and should not be construed as limitations to this application.

Claims

1. A tubing pressure control device for perforation operation of oil and gas wells, characterized in that, It includes an upper joint (1), a lower joint (2), a sliding sleeve (3) and a shear sleeve (4); the upper joint (1) and the lower joint (2) are respectively connected to both ends of the sliding sleeve (3), the sliding sleeve (3) is arranged inside the upper joint (1) through the shear sleeve (4), and a communication hole (13) for well fluid to pass through is provided on the surface of the upper joint (1), and the sliding sleeve (3) can open or close the communication hole (13).

2. The tubing pressure control device for oil and gas well perforation operations according to claim 1, wherein, The shear sleeve (4) is sleeved on the surface of the sliding sleeve (3), and small holes for shear pins to pass through are arranged in the radial direction of the sliding sleeve (3), and the shear sleeve (4) is fixedly connected to the sliding sleeve (3) through the shear pins.

3. The tubing pressure control device for oil and gas well perforating operations according to claim 2, characterized in that, A circlip (31) is provided at one end of the sliding sleeve (3), and at least one sealing ring (34) is provided at the other end.

4. The tubing pressure control device for oil and gas well perforation operation according to claim 3, characterized in that, A step projection (32) is provided between the circlip (31) and the shear sleeve (4), and a support ring (33) is provided between the step projections (32).

5. The tubing pressure control device for oil and gas well perforating operations according to claim 2, wherein, The shear pins include large shear pins (5) and small shear pins (6) with different specifications.

6. The tubing pressure control device for oil and gas well perforating operations according to claim 1, wherein The upper joint (1) is sequentially provided with a first thread (14), a first cavity (16), a second cavity (17), a communication hole (13) and a second thread (15) along the axial direction, and a first step (12) is provided between the first cavity (16) and the second cavity (17).

7. The tubing pressure control device for oil and gas well perforating operations according to claim 6, wherein, A second step (18) is provided at one end of the communication hole (13) away from the second cavity (17).

8. The tubing pressure control device for oil and gas well perforating operations according to claim 1, wherein A concave surface is provided on the outer surface of the upper joint (1), and the communication hole (13) is arranged on the concave surface.

9. The string pressure control device for oil and gas well perforating operations according to claim 6, characterized in that, The lower joint (2) is sequentially provided with a third thread (23) and a third cavity (24) along the axial direction, and an external thread (22) for connecting to the upper joint (1) is provided on the outer surface of the lower joint (2).

10. The string pressure control device for oil and gas well perforating operations according to claim 1, wherein A sealing ring (34) is also provided on the outer surface of the lower joint (2).

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